Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee53353aba1aa88…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 09:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfe94c7e0b5972ea79e429984a5d3f7f SHA-1: 8a867e7494076392f21f1dfa45be046b68a7c300 SHA-256: dee53353aba1aa889c1a1444457b7ccf0410abebf3f310d409607b11ff569636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161347dd6b2355---sorobutiwo.pdf In PDF document text
    • http://hebakotb.net/userfiles/file/dutabalelerubavof.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/patijikatuselob.pdfIn PDF document text
    • https://equinox-e.com/upload/files/24878141396.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/pifem.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448bc514d66---90016535934.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/pulaxatojeneroxajix.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/zupojezirekebivanilige.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/jazabimofejusedokotig.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f780f6e67c---sekiwinujerif.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/56522023391.pdfIn PDF document text
    • http://imaginove.eu/data/Files/24685422399.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9f4ecec7---82816837162.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210908023821_607977953.pdfIn PDF document text
    • https://partnermind.cz/images/files/feduwawarukuveril.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee7ed2300---nerepejafidatebu.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/legobarabawitewemasatev.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fatupup.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/96426702451.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/50379636680.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/zivuxeduxo.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/76369157044.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/kiviwo.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/25081583912.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3deb5e53a2899b7a031dad9251b6af29/88336696154.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb05a49b24---kutuvobapezafufibukejinup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=alternative+to+videoderPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 10120 bytes
SHA-256: c7158c6f15cd05f54f221e6d2e10d295366e3921662238223cce0fb9f9aee588
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 17036 bytes
SHA-256: a5e66c05316e799f3092679e85043873a6984c9250fda232489fc8ff7b96e123
font_02_sfnt_off00011998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1